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      1 /*	$NetBSD: i915_utils.c,v 1.4 2021/12/19 11:37:41 riastradh Exp $	*/
      2 
      3 // SPDX-License-Identifier: MIT
      4 /*
      5  * Copyright  2019 Intel Corporation
      6  */
      7 
      8 #include <sys/cdefs.h>
      9 __KERNEL_RCSID(0, "$NetBSD: i915_utils.c,v 1.4 2021/12/19 11:37:41 riastradh Exp $");
     10 
     11 #include <drm/drm_drv.h>
     12 
     13 #include "i915_drv.h"
     14 #include "i915_utils.h"
     15 
     16 #ifdef __NetBSD__
     17 #define	NBSD_BUG_URL "https://gnats.NetBSD.org/"
     18 #define	NBSD_BUG_MSG							      \
     19 	"Please file a bug at " NBSD_BUG_URL " in category kern"	      \
     20 	" providing the dmesg log by booting with debug/verbose"	      \
     21 	" as in `boot -vx'."
     22 #else
     23 #define FDO_BUG_URL "https://gitlab.freedesktop.org/drm/intel/-/wikis/How-to-file-i915-bugs"
     24 #define FDO_BUG_MSG "Please file a bug on drm/i915; see " FDO_BUG_URL " for details."
     25 #endif
     26 
     27 void
     28 __i915_printk(struct drm_i915_private *dev_priv, const char *level,
     29 	      const char *fmt, ...)
     30 {
     31 #ifdef __NetBSD__
     32 	static volatile unsigned done = 0;
     33 	va_list va;
     34 
     35 	va_start(va, fmt);
     36 	printf("%s: %s ", device_xname(dev_priv->drm.dev), level);
     37 	vprintf(fmt, va);
     38 	va_end(va);
     39 
     40 	if (strncmp(level, KERN_ERR, strlen(KERN_ERR)) == 0 &&
     41 	    atomic_swap_uint(&done, 1) == 0)
     42 		printf("%s\n", NBSD_BUG_MSG);
     43 #else
     44 	static bool shown_bug_once;
     45 	struct device *kdev = dev_priv->drm.dev;
     46 	bool is_error = level[1] <= KERN_ERR[1];
     47 	bool is_debug = level[1] == KERN_DEBUG[1];
     48 	struct va_format vaf;
     49 	va_list args;
     50 
     51 	if (is_debug && !drm_debug_enabled(DRM_UT_DRIVER))
     52 		return;
     53 
     54 	va_start(args, fmt);
     55 
     56 	vaf.fmt = fmt;
     57 	vaf.va = &args;
     58 
     59 	if (is_error)
     60 		dev_printk(level, kdev, "%pV", &vaf);
     61 	else
     62 		dev_printk(level, kdev, "[" DRM_NAME ":%ps] %pV",
     63 			   __builtin_return_address(0), &vaf);
     64 
     65 	va_end(args);
     66 
     67 	if (is_error && !shown_bug_once) {
     68 		/*
     69 		 * Ask the user to file a bug report for the error, except
     70 		 * if they may have caused the bug by fiddling with unsafe
     71 		 * module parameters.
     72 		 */
     73 		if (!test_taint(TAINT_USER))
     74 			dev_notice(kdev, "%s", FDO_BUG_MSG);
     75 		shown_bug_once = true;
     76 	}
     77 #endif
     78 }
     79 
     80 #if IS_ENABLED(CONFIG_DRM_I915_DEBUG)
     81 static unsigned int i915_probe_fail_count;
     82 
     83 int __i915_inject_probe_error(struct drm_i915_private *i915, int err,
     84 			      const char *func, int line)
     85 {
     86 	if (i915_probe_fail_count >= i915_modparams.inject_probe_failure)
     87 		return 0;
     88 
     89 	if (++i915_probe_fail_count < i915_modparams.inject_probe_failure)
     90 		return 0;
     91 
     92 	__i915_printk(i915, KERN_INFO,
     93 		      "Injecting failure %d at checkpoint %u [%s:%d]\n",
     94 		      err, i915_modparams.inject_probe_failure, func, line);
     95 	i915_modparams.inject_probe_failure = 0;
     96 	return err;
     97 }
     98 
     99 bool i915_error_injected(void)
    100 {
    101 	return i915_probe_fail_count && !i915_modparams.inject_probe_failure;
    102 }
    103 
    104 #endif
    105 
    106 void cancel_timer(struct timer_list *t)
    107 {
    108 #ifndef __NetBSD__
    109 	if (!READ_ONCE(t->expires))
    110 		return;
    111 #endif
    112 
    113 	del_timer(t);
    114 #ifndef __NetBSD__
    115 	WRITE_ONCE(t->expires, 0);
    116 #endif
    117 }
    118 
    119 void set_timer_ms(struct timer_list *t, unsigned long timeout)
    120 {
    121 	if (!timeout) {
    122 		cancel_timer(t);
    123 		return;
    124 	}
    125 
    126 	timeout = msecs_to_jiffies_timeout(timeout);
    127 
    128 	/*
    129 	 * Paranoia to make sure the compiler computes the timeout before
    130 	 * loading 'jiffies' as jiffies is volatile and may be updated in
    131 	 * the background by a timer tick. All to reduce the complexity
    132 	 * of the addition and reduce the risk of losing a jiffie.
    133 	 */
    134 	barrier();
    135 
    136 	mod_timer(t, jiffies + timeout);
    137 }
    138